Alumina color-lakes.



. quinone-Q-sulfonic acid are while being hot' UNITED STATES PATENTOFFICE. 4

PAUL TUST, F VOI-IWINKEL, NEAR ELBERFELD, GERMANY, ASSIGNOR TO SYNTHETICPATENTS 00., INC., 0]? NEW YORK, N. Y., A CORPORATION OF NEW YORK.

ALUMINA COLOR-LAKES.

No Drawing.

ing is a specification.

I have found that the lA-dioxyanthraquinone sulfonic acids, such as /CO\on 1 can onion 4) \co/l sons 2 b co on 1 soar! cH. e,n H (4) yieldvaluable pigments or lakes when treated with alumina as substratum. Thenew lakes have a valuable clear bluish-red shade and are .fast to light.

\ I In order to illustrate the new process more fully the followingexamples are given, the parts being by weight:

Example 1: 5 parts of 1.4-dioXyanthradissolved in to times the quantityof water and boiled with 1,000 parts of a solution (1:10) of aluminiumsulfate (18 per cent), then the aluminium lake is precipitated byaddition of parts of calcined sodium carbonate dissolved in 400 parts ofwater, filtered off, washed and dried. I

In order to form size colors 1,000 parts Specification of LettersPatent.

of a solution of barium chlorid (1:10) can be added.

Patented Jan. 26, 1915.

Application filed July 7, 1914. Serial No. 849,382.

Example 2: 3 parts of lA-dioxyanthraquinone-5-sulfonic acid are whilebeing hot I dissolved in 10 to 15 times the quantity of water and boiledfor half an hour with aluminium hydrate (10 per centpaste), filteredoff, washed and dried.

In order to forma lake containing also barium before boiling 30 parts ofa solution of barium chlorid (1:10) are added.

Any other method for producing pigments or lakes can be used.

I claim I 1. The new red alumina color lakes prepared fromlA-dioxyanthraquinone sulfonic acids and containing aluminium, saidlakes being distinguished by their valuable bluishred shade-and theirfast'ness to light, substantially as described.

2. The new red alumina color lake prepared fromlA-dioxyanthraquinone-Q-sulfonic acid and containing aluminium, saidlake being distinguished by its valuable bluish-red shades and itsfastness to light, substantially as described.

In testimony whereof 'I have hereunto set my hand in the presence of twosubscribing witnesses.

PAUL TUST. [L. s.] Witnesses:

HEL N NUFER, FRANCES Nurse.

